package cn.com.interceptor;

import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

public class CommonInterceptor implements HandlerInterceptor {
	private List<String> excludedUrls;

	public List<String> getExcludedUrls() {
		return excludedUrls;
	}

	public void setExcludedUrls(List<String> excludedUrls) {
		this.excludedUrls = excludedUrls;
	}

	/**
	 * 
	 * @Description: 在业务处理器处理请求之前被调用 如果返回false
	 *               从当前的拦截器往回执行所有拦截器的afterCompletion(), 再退出拦截器链, 如果返回true
	 *               执行下一个拦截器, 直到所有的拦截器都执行完毕 再执行被拦截的Controller 然后进入拦截器链,
	 *               从最后一个拦截器往回执行所有的postHandle()
	 *               接着再从最后一个拦截器往回执行所有的afterCompletion()
	 * 
	 * @param request
	 * 
	 * @param response
	 * 
	 * @return: boolean
	 * 
	 * @author: SongJia
	 * 
	 * @date: 2016-6-27 下午4:17:51
	 * 
	 */
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
			throws Exception {
		response.setHeader("Access-Control-Allow-Origin", "*");
		response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
		response.setHeader("Access-Control-Max-Age", "3600");
		response.setHeader("Access-Control-Allow-Headers", "x-requested-with");
		return true;
	}

	// 在业务处理器处理请求执行完成后,生成视图之前执行的动作
	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
			ModelAndView modelAndView) throws Exception {

	}

	/**
	 * 
	 * @Description: 在DispatcherServlet完全处理完请求后被调用 当有拦截器抛出异常时,
	 *               会从当前拦截器往回执行所有的拦截器的afterCompletion()
	 * 
	 * @param request
	 * 
	 * @param response
	 * 
	 * @param handler
	 * 
	 * @param ex
	 * 
	 * @author: SongJia
	 * 
	 * @date: 2016-6-27 下午4:27:51
	 * 
	 */
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
			throws Exception {

	}

}